Be ready for any tuner installation! Our custom-sized counterbore reamers ensure that your press-fit tuner bushings will fit correctly. Before you install press-fit tuner bushings, be sure they'll fit correctly, so your tuners will work efficiently. Too tight, and they can chip the peghead finish or crack the wood. Too loose, and they can rattle or fall out. Our custom reamers cut a clean, accurate counterbore for a professional job. Specs: Designed for slow-speed use in your drill press Overall length: 2-3/4" (69.85mm) 1/4"-diameter (6.35mm) pilot Two 1" (25.40mm) cutting flutes This money-saving set of 5 includes reamers of the following sizes: .290" (7.37mm) cutting diameter .328" (8.33mm) cutting diameter* .340" (8.64mm) cutting diameter* .348" (8.84mm) cutting diameter .393" (9.98mm) cutting diameter *The .328"-diameter reamer is made for bushings on Waverly Mandolin Tuning Machines. The .340"-diameter reamer is made for bushings on Waverly Guitar Tuning Machines. Important: To ensure accurate hole sizing, please measure your tuner bushings before your order a reamer.